Search your deck for a card and exile it. Then shuffle your library.
Draw 1 card.
Backflash (You may cast this exiled card for its backflash cost. Then put it in your graveard.)
And the obligatory
Creature - Human Shaman
When Snapcaster Shaman enters the battlefield, target exiled instant or sorcery card gains backflash until end of turn. The backflash cost is equal to its mana cost. (You may cast that exiled card for its backflash cost. Then put it in your graveyard.)